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STOCK BASED AND DEFERRED COMPENSATION - Summary of Additional Information Regarding Stock Plan (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Summary of stock based compensation agreements |  |  |
Unrecognized stock-based compensation cost |  | $ 29,890 | $ 22,687
Weighted average years expense recognition period |  | 2 years 7 days | 2 years 3 days
Total stock-based awards outstanding (in shares) | [1] | 910,557 | 1,098,545
Payout percentage |  | 100.00% |
[1] | Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.

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